At the direction of posters in my last post I've spent a ton of money and decided to reline and redo my entire chimney setup. First flue is in and I have an issue I didn't forsee. The masonry adapter for the duravent system is too small. This slip pipe does not reach out of my chimney thimble enough to be able to connect the stove. At it's longest it's under 12" with barely overlapping the pipes. I need about 15". Does anyone know of a longer option or should I just use a chunk of normal stove pipe to extend it out? Photos below. Thank you.